If the shape of your code begins to look like something out of the gilded-rose kata [1], it's usually a sign that it could use a good refactoring.

[1] https://github.com/guyroyse/gilded-rose-javascript/blob/mast...

This is not constructive feedback. Try again.

I don't think being opensource justifies bad code quality.

What is bad in this code (except concatenation thing)?